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CN1201548C - Mobile station and base station - Google Patents

Mobile station and base station Download PDF

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Publication number
CN1201548C
CN1201548C CNB001270397A CN00127039A CN1201548C CN 1201548 C CN1201548 C CN 1201548C CN B001270397 A CNB001270397 A CN B001270397A CN 00127039 A CN00127039 A CN 00127039A CN 1201548 C CN1201548 C CN 1201548C
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Prior art keywords
electric field
field strength
base station
traffic channel
link
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CNB001270397A
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CN1287432A (en
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米山雅之
原田茂树
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Abstract

一种移动台，它根据通过与多个基站对应的控制信道发射的信号的电场强度从所述多个基站中选择一个，并通过借助于控制信道分配的、与选中的基站对应的业务信道，首先与选中的基站建立链路，然后建立与该基站的呼叫连接，所述移动台包括：测量装置，用来测量当执行链路操作以便建立用于业务信道的链路时业务信道上信号的电场强度；和判断装置，用来根据所测得的电场强度判断链路操作是否还应继续。

Figure 00127039

A mobile station that selects one of the plurality of base stations based on the electric field strength of signals transmitted through control channels corresponding to the plurality of base stations, and through a traffic channel assigned by means of the control channel corresponding to the selected base station, First establish a link with the selected base station, and then establish a call connection with the base station, the mobile station includes: measuring means for measuring the signal on the traffic channel when the link operation is performed in order to establish a link for the traffic channel electric field strength; and judging means for judging whether the link operation should continue according to the measured electric field strength.

Figure 00127039

Description

Travelling carriage and base station
The present invention relates to a kind of travelling carriage, it is according to the electric field strength of the control channel of a plurality of base stations and from a plurality of base station selected one, and is connected with calling out by setting up link by the Traffic Channel of the base station assigns of choosing with this base station.The invention still further relates to the base station that is used for described travelling carriage.
In recent years, be used for mobile communication system, be used widely such as the travelling carriage of personal handyphone system (PHS) and personal digital cellular telecommunication system usefulness such as (PDC), because their volumes are little, in light weight and communication quality is better.
In PHS and PDC system, communication utilizes Traffic Channel (hereinafter to be referred as TCH) and control channel (C H) to carry out between travelling carriage and base station.Here, TCH means the channel that is used for communicating usefulness between travelling carriage and base station, and CCH means when the travelling carriage that is in stand-by state sends with call accepted, is used for controlling switching to the channel that TCH uses.
The link channel that Fig. 7 carries out when representing to switch to TCH by base station selection process of carrying out based on the traditional travelling carriage of PHS method (being called " PS " among the figure) and the CCH between travelling carriage and traditional base station is set up sequence (being called " CS " among the figure).
For example, when described travelling carriage (1) energized, (2) are searched in new base station and (3) communication process to be specified by current base station in handover procedure and are carried out base station selection process when switching to new base station.
In base station selection process, travelling carriage at first monitors the CCH of a plurality of base stations.Under the situation of PHS, distribute specific frequency to be used for CCH, and a plurality of base station send signal with time division multiple access way on their CCH.Travelling carriage sequentially is received in each CCH and goes up the signal that sends, and with this signal decoding, if detect the identifier (CSID) of base station from decoded signal, then its electric field strength together with this signal is stored (S51).Like this, travelling carriage just obtain a plurality of CSID and electric field strength right.Travelling carriage is with the descending sort (S52) of these information with electric field strength, and selection has the base station (S53) of the CSID that matches with maximum field intensity.Then, travelling carriage enters stand-by state on the CCH of the base station of choosing.If base station selection process is carried out after the travelling carriage energized immediately, then travelling carriage carried out the location registers about the base station of choosing before entering stand-by state.
For example, when travelling carriage (1) sends calling under stand-by state, when (2) receipt of call and (3) under stand-by state switch to new base station in handover procedure, carry out link channel and set up sequence.
Set up in the sequence at link channel, the CCH of travelling carriage by the base station chosen in base station selection process sends link channel to this base station and sets up request (S151), receive link channel assignment messages (the link channel assignment messages is sent in the request of setting up of this base station in response link channel) from this base station (S152), and the electric field strength (this TCH is specified by this link channel assignment messages) of measuring the U ripple (undesirable ripple) of the TCH that is distributed (S153).Because being link channel, this measurement carries out immediately after distributing, that is before exchanging any signal by TCH between base station and the travelling carriage, carry out, so the TCH that the electric field strength that records representative is distributed goes up the level (electric field strength) of U ripple (disturbing wave).If the level height of U ripple is then handled and returned S151, carry out the aforesaid operations of S151-S153 once more.
If the level of U ripple is low, then travelling carriage sends synchronization burst signal (S154) to the base station, the base station is to travelling carriage loopback synchronization burst signal (S155), and travelling carriage sends TCH idle burst signal (S156) to the base station, and the base station is to travelling carriage loopback TCH idle burst signal (S157).Like this, just, on TCH, set up synchronously.Above-mentioned processing procedure till synchronous foundation is that link channel is set up sequence, and is equivalent to layer 1 (physical layer).
Link channel is set up after the sequence, and travelling carriage checks whether the base station has been ready for communication, and the base station checks whether travelling carriage has been ready for communication (S159 and S160) then.This processing procedure is equivalent to layer 2 (data link layer).
After layer 1 and layer 2, switched call connection message or location registers message between base station and travelling carriage.This processing procedure is equivalent to layer 3 (network layer) and the layer of layer more than 3.
More than be that example has been described and is used for setting up sequence from CCH to base station selection process and link channel that TCH switches with the situation of PHS.But, channel classification be CCH and TCH such as the other system of PDC in also carry out similar processing procedure.
In some cases, the base station is distributed to travelling carriage to the much lower TCH that is not enough to carry out such as practical communications such as dialogues of the CCH of its electric field ratio supervision.Under these circumstances, various problem is arranged, such as unsuitable message and wireless connections fault etc. in high FER (Floating Error Rate), the layer 2 and 3.
This is that the transmitting power control undertaken by the base station and the variation of travelling carriage condition of acceptance cause.Transmitting power control means the electric field strength that the transmits adjustment transmitting power that send according to travelling carriage the base station.In many cases, the transmitting power of 500mw (milliwatt) is used in the base station of PHS on CCH, and by means of carrying out power control, is scope that the power of 20mw to 500mw is used for by the TCH emission.As a result, in some cases, the electric field strength of distributing to the TCH of travelling carriage is different from CCH significantly.In addition, since travelling carriage direction and the variation of position and the influence (especially the position of travelling carriage changes when user's high-speed mobile) of nearby buildings, the condition of acceptance generation significant change of travelling carriage.As a result, in some cases, the TCH that its electric field strength is not enough to carry out practical communication distributes to travelling carriage.
Therefore, an object of the present invention is to provide the base station that a kind of travelling carriage and this travelling carriage are used, wherein can give described travelling carriage the traffic channel assignments that transmission error seldom appears in its electric field strength certainly.
Above-mentioned purpose reaches with a kind of like this travelling carriage, it selects one according to the electric field strength of the signal of launching by the control channel corresponding with a plurality of base stations from a plurality of base stations, and Traffic Channel by distributing by the control channel corresponding with the base station of choosing, at first set up with the link of the base station of choosing and be connected, set up then to call out and connect, this travelling carriage comprises: measurement mechanism is used for measuring when setting up link when carrying out link operation so that for Traffic Channel the electric field strength of signal on the Traffic Channel; And judgment means, be used for judging according to measured electric field strength whether link operation also should continue.
Adopt such structure, can judge whether link operation also should continue according to measured electric field strength.In other words, just when measured electric field strength is enough to carry out actual communication, just sets up link and be connected with calling out.This has guaranteed that having the traffic channel assignments that makes the electric field strength that transmission error seldom occurs to one gives described travelling carriage.
Here, when measured electric field strength was not more than predetermined value, judgment means can judge that just link operation should finish.If judgment means judged that link operation should finish, then travelling carriage can be selected one again from a plurality of base stations, and the base station assigns Traffic Channel chosen again of request.
Adopt such structure, if the electric field strength that records is not more than predetermined value, the base station assigns Traffic Channel chosen again of travelling carriage request then.This has guaranteed that having the traffic channel assignments that can make the electric field strength that transmission error seldom occurs to one gives described travelling carriage.
Here, the electric field strength that records can comprise signal level and noise level, signal level is by the received signal level of Traffic Channel when the base station of choosing receives signal, and noise level is by the received signal level of Traffic Channel when the base station of choosing does not receive signal, if the difference that signal level is not more than between first threshold or signal level and the noise level is not more than second threshold value, then judgment means can judge that link operation should finish.
Adopt such structure, judgment means judges according to the signal level and the noise level of Traffic Channel whether link operation should continue.As a result, give travelling carriage a traffic channel assignments that transmission error seldom occurs more reliably.
Here, if judgment means judged that link operation should finish, then travelling carriage is reselected one from described a plurality of base stations, and the base station assigns Traffic Channel reselected of request.When reselecting one from described a plurality of base stations, travelling carriage can be selected the base station selected in the past once more.
Adopt such structure, if judgment means judged that link operation should finish, then travelling carriage is reselected the base station, and the base station assigns Traffic Channel reselected of request.As a result, be certain to give described travelling carriage a traffic channel assignments that transmission error seldom occurs.
Above-mentioned purpose also reaches by such base station, it gives travelling carriage distribution service channel, and at first set up link by described Traffic Channel and described travelling carriage, set up then to call out and connect, it comprises: measurement mechanism is used for measuring the electric field strength on the Traffic Channel when setting up link when carrying out link operation so that for Traffic Channel; And judgment means, be used for judging according to measured electric field strength whether link operation should continue.
Adopt such structure, whether link operation should continue to be to judge according to measured electric field strength.In other words, just when the electric field strength that records is enough to carry out actual communication, just sets up link and be connected with calling out.This assurance meeting has the traffic channel assignments that makes the electric field strength that transmission error seldom occurs to one and gives described travelling carriage.
Here, measured electric field strength can comprise signal level and noise level, and judgment means can judge whether link operation should continue according to described signal level and noise level.
Adopt such structure, judgment means judges according to the signal level and the noise level of Traffic Channel whether link operation should continue.As a result, give described travelling carriage a traffic channel assignments that transmission error seldom occurs more reliably.
From the following description of the present invention being carried out in conjunction with the accompanying drawing that illustrates certain embodiments of the present invention, these and other purposes of the present invention, advantage and feature will become clearer.
In the accompanying drawing:
Fig. 1 is the block diagram of structure of the travelling carriage of expression one embodiment of the invention;
Fig. 2 represents the structure of TDMA/TDD frame;
Fig. 3 represents that the base station selection process of this embodiment and link channel set up sequence;
Fig. 4 is the flow chart that the detailed link channel of expression travelling carriage is set up processing procedure;
Fig. 5 is the block diagram of structure of the base station of expression this embodiment of the invention;
Fig. 6 is the flow chart that the detailed link channel in expression base station is set up processing procedure; And
Fig. 7 represents that traditional base station selection process and link channel set up sequence.
The travelling carriage of one embodiment of the invention is now described with reference to the accompanying drawings.
" structure of travelling carriage "
Fig. 1 is the block diagram of the structure of expression travelling carriage of the present invention.As shown in the drawing, travelling carriage comprises antenna 10, emission/reception switching device shifter 11, radio device 12, modem (modulator-demodulator) device 13, TDMA/TDD (TDMA/TDD) device 14, acoustic processing device 15, microphone 16, loud speaker 17 and control device 18.Adopt such structure, if the process that exchanges to TCH from CCH, find RSSI (indication of received signal intensity) deficiency by the TCH of base station assigns, this another TCH of travelling carriage request base station assigns or ask another base station assigns TCH then.Here be noted that RSSI also is called electric field strength in this manual.
It is total that the circuit part that comprises antenna 10, emission/reception switching device shifter 11, radio device 12, modem device 13, TDMA/TDD device 14, acoustic processing device 15, microphone 16 and loud speaker 17 among this figure is based on the travelling carriage of TDMA/DD method, and for example carry out the radio communication by the TDMA/TDD method of PHS standard " RCR STD-28 " regulation.Therefore, this part is here no longer described, describe TDMA/TDD method below briefly.
Fig. 2 represents the TDMA/TDD frame that the time division multiple access method is used among the PHS.In the present embodiment, 5 milliseconds of each frame lengths of TDMA/TDD method are divided into 8 time slots.First to fourth time slot allocation is given downlink communication (communication from the base station to the travelling carriage), and the 5th to the 8th time slot allocation is given uplink communication (communication from the travelling carriage to the base station).After this time slot that downlink communication is used is called " descending time slot ", and the time slot that uplink communication is used is called " ascending time slot ".
Each TCH is a pair of ascending time slot and descending time slot, and for example, TCH is made up of first time slot and the 5th time slot, and another TCH is made up of second time slot and the 6th time slot.In addition, distribute a plurality of carrier frequencies (approximately 10-20 ripple) for each TCH.Therefore, utilize carrier frequency (carrier number), ascending time slot number and descending time slot number to specify each TCH.
Each CCH also is a pair of ascending time slot and descending time slot.For each CCH assigns one or two carrier frequency (ripple), and utilize the carrier wave of CCH to transmit discontinuously.For example, each base station per 100 milliseconds (20 frame) and travelling carriage switching signal are once.In this case, travelling carriage can utilize the carrier wave of CCH and reach 80 base stations (20 frames * 4 (number of channel in the frame)) switching signal with time division multiple access way.
Control device 18 comprises memory 181 and CPU (CPU) 182, and by carrying out the overall operation that the program that is stored in the memory 181 is controlled travelling carriage with CPU 182.Under the control of control device 18, the link channel in order to exchange to TCH from CCH shown in the travelling carriage execution graph 3 is set up sequence.Specifically, under the control of control device 18, travelling carriage sends the request (S10) of distribution T CH to this base station by the CCH of current base station, reception from the TCH assignment messages of base station (the TCH assignment messages is sent in this distribution T of base station in response CH request) (S11), utilize RSSI checkout gear 124 to detect to pass through the TCH that distributed the RSSI of signals that is used for setting up link (S16), judge whether RSSI equals threshold value " Th1 " (S17) at least from base station.If RSSI is less than threshold value Th1, then travelling carriage finishes the link establishment processing procedure, and sends the TCH request for allocation again by CCH.
In S1 7, travelling carriage judges also whether the difference between the RSSI of the RSSI of TCH and U ripple (disturbing wave) equals threshold value " Th2 " at least.If this difference is less than threshold value Th2, then travelling carriage sends the TCH request for allocation again.Here the RSSI that is noted that the U ripple represents noise level.
If the RSSI of TCH equals threshold value Th1 at least, and the difference between the RSSI of the RSSI of TCH and U ripple also equals threshold value Th2, then travelling carriage continuation and base station exchange burst (in order to set up synchronous signal) at least.Like this, between travelling carriage and base station, just set up link by TCH.
As mentioned above, if the electric field strength of the TCH that the base station is distributed is not enough to carry out practical communication (such as session), then travelling carriage sends the TCH request for allocation again, to obtain the distribution of another TCH.As a result, before the actual communication of beginning, the TCH that transmission error is seldom occurred distributes to travelling carriage.
" link channel of travelling carriage is set up processing procedure "
Fig. 4 is the flow chart that detailed link channel that current mobile station is carried out under the control of control device 18 is set up processing procedure.Described link channel is set up processing procedure and is carried out for switching to TCH from CCH, and comprises by base station assigns TCH with by this TCH and carry out setting up synchronously before the practical communication.Described link channel is set up processing procedure and is equivalent to the processing procedure that link channel shown in Fig. 3 is set up travelling carriage in the sequence.For example, when travelling carriage (1) sends calling by CCH under stand-by state, (2) under stand-by state by CCH from the base station receipt of call, (3) switch to new base station distinguishing more in the exchange process, when (4) carrying out location registers again, carry out this processing procedure.
In these cases, travelling carriage is operated as follows under the control of control device 18.Travelling carriage at first sends link channel foundation request (S41) by the CCH of current base station to this base station, and receives the link channel assignment messages from this base station (the link channel assignment messages is sent in the request of setting up of base station in response link channel).Described link channel assignment messages comprises travelling carriage carrier number and each timeslot number in order to find out the carrier frequency of having distributed which TCH.Then, travelling carriage with radio device 12 be tuned on the TCH that distributed, utilize RSSI checkout gear 124 to detect the RSSI of TCH that is the RSSI (S43) of the U ripple (disturbing wave) of TCH in the time of not from base station transmit signals.
If the RSSI of U ripple surpasses threshold value " Th_u ", then step S41 is returned in the operation of travelling carriage, sets up request so that send link channel again.This is because if the RSSI of U ripple surpasses Th_u, mean that then the TCH that is distributed is used by near base station, thereby need to give this travelling carriage to distribute another TCH.
If the RSSI of U ripple is no more than threshold value Th_u, then the travelling carriage TCH that passes through to be distributed is to base station synchronization burst signal (S45).Here, the synchronization burst signal comprises 32 bit codes that are known as UW32 (unique word 32), and launches in each TDMA/TDD frame, so as TDMA/TDD frame level and timeslot-level on set up synchronously.The base station is set up when receiving the synchronization burst signal synchronously, and sequentially by TCH to the described synchronization burst signal of travelling carriage loopback.
When receiving described synchronization burst signal from the base station by TCH (S46), travelling carriage utilizes RSSI checkout gear 124 to detect the RSSI (S47) of TCH.Here, RSSI checkout gear 124 calculates the mean value of the electric field strength of the TCH that records in a plurality of (for example, 10) time slot, and this mean value is set to the RSSI of TCH.
Then, travelling carriage is judged the RSSI of TCH (1) and (2) (S48 and the S49) that whether meet the following conditions.
(RSSI of TCH) 〉=Th1..................................... (1)
(RSSI of TCH)-(RSSI of U ripple) 〉=Th2................. (2)
Threshold value Th1 in the above condition and Th2 determine by rule of thumb or by test.For example, obtain to be provided with the receiving feature curve of its coordinate in advance, determine so then these threshold values to make BER drop within the scope that guarantees high communication quality with the form of BER (bit error rate) and RSSI.
If above-mentioned two conditions can not be met the then CCH of another base station of mobile station in selecting (S50), and return S41 simultaneously.When doing like this, travelling carriage in the middle of the base station with the descending sort of RSSI, is selected next the highest base station in base station selection process, perhaps carry out base station selection process once more, and reselect the CCH of base station.In order to shorten the time of this processing procedure, would rather select the CCH of next the highest base station, rather than carry out base station selection process once more.
If above-mentioned two conditions all are met, then travelling carriage passes through this TCH to base station TCH idle burst signal (S51).Here, each TCH idle burst signal comprises 16 bit codes that are called as UW16 (unique word 16), and emission sequentially is so that set up synchronously on symbol level.Set up when TCH idle burst signal is received in the base station synchronously, and sequentially by TCH to travelling carriage loopback TCH idle burst signal.When receiving TCH idle burst signal from the base station (S52), travelling carriage sends SABM (asynchronous balance mode is set) by TCH to the base station, and receives UA (unnumbered acknowledge) (S53 and S54) by TCH.Like this, just, on layer 2 (data link layer), set up data link.After the above-mentioned processing procedure, set up calling by TCH and connect, travelling carriage then enters session status or carries out location registers by TCH.
Here be noted that in Fig. 4, travelling carriage is not no end to wait for, set up signal, receive the synchronization burst signal, receive TCH idle burst signal, and receive UA at S54 at S52 at S46 so that receive link channel at S42.In other words, if even still do not receive these signals after the past at preset time (about 100ms), then travelling carriage turns back to the operation of S41, sets up processing procedure so that carry out link channel once more.Travelling carriage is carried out the link establishment processing procedure at most about 5 times in case of necessity.
As mentioned above, if the electric field strength (RSSI) of the TCH that the base station is distributed is not enough to carry out actual communication, then the travelling carriage of present embodiment sends link channel again and sets up request, to obtain the distribution of another TCH.Like this, before switching to TCH just one have enough electric field strength distribute to the TCH travelling carriage, thereby guarantee high communication quality.
" structure of base station "
Fig. 5 is the block diagram of structure of the base station of the expression embodiment of the invention.As shown in FIG., this base station comprises antenna 100, emission/reception switching device shifter 110, radio device 120, modem device 130, TDMA/TDD (TDMA/TDD) device 140, acoustic processing device 150, network side I/F (intermediate frequency) 160 and control device 180.Adopt such structure, find to be not enough to carry out actual communication in the sequence process if the RSSI of the TCH that response distributes from the request of travelling carriage sets up at link channel, then the base station is finished link channel and is set up and handle sequence.Process finishes because link channel is set up sequence, sets up request so travelling carriage sends link channel again.
The circuit part that comprises antenna 100, emission/reception switching device shifter 110, radio device 120, modem device 130, TDMA/TDD device 140, acoustic processing device 150 and network side I/F 160 among this figure is based in each base station of TDMA/TDD method common, and for example carries out the radio communication of the TDMA/TDD method of PHS standard " RCR STD-28 " regulation.Therefore, at this described part is described no longer.
Control device 180 comprises memory 1810 and CPU (CPU) 1820, and by utilizing CPU 1820 to carry out the overall operation that the program that is stored in the memory 1810 is controlled the base station.Under the control of control device 180, the base station is carried out the link channel in order to switch to TCH from CCH shown in Figure 3 and is set up sequence.Specifically, under the control of control device 180, the synchronization burst RSSI of signals (S12) that the TCH that the base station utilizes 1240 detections of RSSI checkout gear to pass through to be distributed launches from travelling carriage judges whether RSSI equals threshold value " Th3 " (S14) at least.If RSSI is less than threshold value Th3, then end link channel in base station is set up processing procedure.Because setting up processing procedure, finishes link channel, so travelling carriage sends the TCH request for allocation again by CCH.
If the RSSI of TCH equals threshold value Th3 at least, then the base station judges whether the difference between the RSSI of the RSSI of TCH and U ripple (disturbing wave) equals threshold value " Th4 " at least.If this difference is less than threshold value Th4, then end link channel in base station is set up processing procedure.
If the RSSI of TCH equals threshold value Th3 at least, and the difference between the RSSI of the RSSI of TCH and U ripple also equals threshold value Th4, then base station continuation and travelling carriage exchange burst (setting up the signal of synchronous usefulness) at least.Like this, between travelling carriage and base station, just set up link by TCH.
" setting up processing procedure " by the link channel that carry out the base station
Fig. 6 is illustrated in the flow chart that the link channel of being carried out by the base station under the control of control device 180 is set up processing procedure.Link channel shown in the figure is set up processing procedure and is equivalent to the processing procedure that link channel shown in Figure 3 is set up base station in the sequence.
Under the control of control device 180, base station operation is as follows.The base station at first receives link channel foundation request (S61) by the TCH of base station from travelling carriage, measure the U ripple level (S62) of each carrier frequency of TCH, produce a free time (not using) channel list according to measurement result, select the minimum idle TCH (S63) of U ripple level in the inventory, send link channel assignment messages (S64) to travelling carriage by CCH.
By the TCH that distributes when travelling carriage receives synchronization burst signal (S65), the base station utilizes rssi measurement device 1240 to measure the RSSI (S66) of TCH.Here, rssi measurement device 1240 calculates the mean value of the electric field strength that records in a plurality of (for example, 10) time slot, and this mean value is set to the RSSI of this TCH.
The RSSI of this TCH (3) and (4) (S67 and the S68) that whether meet the following conditions judged in the base station then.
(RSSI of TCH) 〉=Th3..................................... (3)
(RSSI of TCH)-(RSSI of U ripple) 〉=Th4................. (4)
Threshold value Th3 in the above condition and Th4 determine by rule of thumb or by test.For example, obtain to be provided with the receiving feature curve of coordinate in advance, determine so then these threshold values to make BER drop within the scope that guarantees high communication quality with the form of BER (bit error rate) and RSSI.
If above-mentioned two conditions can not be met simultaneously, then end link channel in base station is set up processing procedure, and the TCH of current distribution is deleted from the idle channel inventory.Set up processing procedure even be noted that the base station link channel that is through with here, the base station still transmits to travelling carriage by CCH discontinuously.Because in this case, the synchronization burst nonpassage of signal is crossed TCH and is returned from the base station, so travelling carriage judges that synchronous foundation ends in failure, and sends link channel foundation request by CCH again.
If above-mentioned two conditions (3) and (4) all are met, then the base station is sent synchronization burst signal (S69) back to by this TCH, and continues link channel and set up processing procedure (carrying out the operation of S70-S73).
As mentioned above, if the electric field strength (RSSI) of distributing to the TCH of travelling carriage is not enough to carry out actual communication, then the base station of present embodiment will be finished link channel and be set up processing procedure.Finish because link channel is set up processing procedure, set up request so travelling carriage just sends link channel again.Like this, the TCH that the base station just guarantees its electric field strength is enough to carry out practical communication distributes to described travelling carriage, and guarantees to carry out high-quality communication.
" modification "
Below travelling carriage of the present invention and base station have been described, although obviously the present invention is not limited to this embodiment by embodiment.Other modification are described below.
(1) shown in Fig. 3 and 4, the synchronization burst RSSI of signals that the emission of travelling carriage calculation base station comes in above embodiment.But travelling carriage can replace the TCH idle burst RSSI of signals of calculating from base station.In this case, travelling carriage is done such modification, so that carry out the calculation processes (S47-S50) of RSSI between S52 in flow chart shown in Figure 4 and the S53.In addition, except that calculating the synchronization burst RSSI of signals, travelling carriage can also calculate TCH idle burst RSSI of signals.In this case, travelling carriage is done such modification, so that carry out the calculation processes (S47-S50) of RSSI between S52 in flow chart shown in Figure 4 and the S53 once more.
(2) the same with modification (1), the synchronization burst RSSI of signals is not calculated in the base station, and calculates TCH idle burst RSSI of signals.In this case, such modification is done in the base station, so that carry out the calculation processes (S66-S68) of RSSI between S70 in flow chart shown in Figure 6 and the S71.In addition, except calculating the synchronization burst RSSI of signals, travelling carriage can also calculate TCH idle burst RSSI of signals.In this case, such modification is done in the base station, so that carry out the calculation processes (S66-S68) of RSSI between S70 in flow chart shown in Figure 6 and the S71 once more.
(3) in Fig. 4, travelling carriage is compared the RSSI of TCH and threshold value Th1 at S47-S50, and difference and the threshold value Th2 between the RSSI of the RSSI of TCH and U ripple compared.Even only carry out these in relatively but travelling carriage is modified as, the present invention also can obtain enough effects.In this case, omit among step S48 in the flow chart shown in Figure 4 and the S49 one.
(4) as revising (3), can do such modification, so that omit among the step S67 and S68 in the flow chart shown in Figure 6 to the base station.
(5) in step S49 shown in Figure 4 and step S68 shown in Figure 6, difference and threshold value between the RSSI of the RSSI of TCH and U ripple are compared.But, in these steps, also can ratio and the threshold value between the RSSI of the RSSI of TCH and U ripple be compared.
(6) in the above-described embodiments, travelling carriage of the present invention and base station applies in so-called cordless telephone generation 2 system (PHS).But the present invention also can be applied to any other system, and such as PDC, wherein communication channel is classified as CCH and TCH (for example, perhaps the time slot of the frequency f of CCH or CCH and TCH different).
(7) in Fig. 4, judge at S48 whether the RSSI of the TCH distributed equals Th1 at least, and judge at S49 whether the difference between the RSSI of the RSSI of TCH and U ripple equals Th2 at least.But, the invention is not restricted to these.For example, can judge whether the RSSI of the TCH distributed is not more than Th1, and judge at S49 whether the difference between the RSSI of the RSSI of TCH and U ripple is not more than Th2 at S48.
(8) in Fig. 6, judge at S67 whether the RSSI of the TCH distributed equals Th3 at least, and judge at S68 whether the difference between the RSSI of the RSSI of TCH and U ripple equals Th4 at least.But, the invention is not restricted to these.For example, can judge whether the RSSI of the TCH distributed is not more than Th3, and judge at S68 whether the difference between the RSSI of the RSSI of TCH and U ripple is not more than Th4 at S67.
Although with reference to accompanying drawing the present invention has been done sufficient description by way of example, be noted that for the professional and technical personnel, obviously can make various variations or modification.Therefore, unless such variation or modification depart from the scope of the present invention, otherwise all should be included in wherein.

Claims (13)

1.一种移动台，它根据与多个基站对应的控制信道上发射的信号的电场强度从所述多个基站中选择一个，并通过借助与所述选中的基站对应的控制信道分配的业务信道，首先与所述选中的基站建立链路，然后建立与该基站的呼叫连接，1. A mobile station that selects one of a plurality of base stations based on the electric field strength of signals transmitted on control channels corresponding to the plurality of base stations, and transmits traffic allocated by means of the control channel corresponding to the selected base station channel, first establishes a link with the selected base station, and then establishes a call connection with the base station, 所述移动台包括：The mobile station includes: 测量装置，用来测量当执行链路操作以便建立用于所述业务信道的链路时所述业务信道上信号的电场强度；和measuring means for measuring the electric field strength of a signal on said traffic channel when a link operation is performed to establish a link for said traffic channel; and 判断装置，用来根据所述测得的电场强度判断所述链路操作是否还应继续，judging means for judging whether the link operation should continue according to the measured electric field strength, 其中，所述测量装置通过计算在多个时隙中测量的电场强度的平均值来测量电场强度，以及wherein the measuring means measures the electric field strength by calculating an average value of the electric field strengths measured in a plurality of time slots, and 所述测得的电场强度包括信号电平和噪声电平，所述信号电平是在通过所述业务信道从所述选中的基站接收到信号时的接收信号电平，而所述噪声电平是在通过所述业务信道从所述选中的基站接收不到信号时的接收信号电平，以及The measured electric field strength includes a signal level when a signal is received from the selected base station over the traffic channel and a noise level, the noise level being the received signal level when no signal is received from said selected base station over said traffic channel, and 若所述信号电平小于第一阈值，或所述信号电平与所述噪声电平之间的差值小于第二阈值，则所述判断装置判定所述链路操作应该结束。If the signal level is smaller than a first threshold, or the difference between the signal level and the noise level is smaller than a second threshold, the judging means judges that the link operation should end. 2.权利要求1的移动台，其特征在于：若所述判断装置已判定所述链路操作应该结束，则所述移动台从所述多个基站重新选择一个，并请求所述重新选中的基站分配业务信道。2. The mobile station of claim 1, wherein if said judging means has judged that said link operation should end, said mobile station reselects one from said plurality of base stations, and requests said reselected The base station allocates traffic channels. 3.一种移动台，它根据与多个基站对应的控制信道上发射的信号的电场强度从所述多个基站中选择一个，并通过由所述选中的基站分配的业务信道，首先与所述选中的基站建立链路，然后建立与该基站的呼叫连接，3. A mobile station, which selects one of the plurality of base stations according to the electric field strength of the signal transmitted on the control channel corresponding to the plurality of base stations, and first communicates with the plurality of base stations through the traffic channel allocated by the selected base station establish a link with the selected base station, and then establish a call connection with the base station, 所述移动台包括：The mobile station includes: 请求装置，用来通过与所述选中的基站对应的控制信道向所述选中的基站发出业务信道分配请求；requesting means, configured to send a traffic channel allocation request to the selected base station through a control channel corresponding to the selected base station; 测量装置，用来在所述选中的基站分配所述业务信道之后测量所述选中的基站通过所述业务信道发送的链路建立信号的电场强度，其中所述测量装置通过计算在多个时隙中测量的电场强度的平均值来测量电场强度；Measuring means for measuring the electric field strength of the link establishment signal sent by the selected base station through the traffic channel after the selected base station allocates the traffic channel, wherein the measuring means calculates the The electric field strength is measured by the average value of the electric field strength measured in 判断装置，用来判断所述测得的链路建立信号的电场强度是否小于一个阈值；和Judging means, used to judge whether the measured electric field strength of the link establishment signal is less than a threshold; and 控制装置，若所述判断装置已判定所述测得的链路建立信号的电场强度小于所述阈值，则用来结束链路操作，所述链路操作建立用于所述业务信道的链路，并让所述请求装置或者通过与所述选中的基站对应的控制信道、或者通过与重新选中的基站对应的控制信道重新发出业务信道分配请求，control means, if the judging means has judged that the measured electric field strength of the link establishment signal is less than the threshold value, it is used to end the link operation, the link operation establishes the link for the traffic channel , and let the requesting means resend the traffic channel allocation request either through the control channel corresponding to the selected base station or through the control channel corresponding to the reselected base station, 其中所述测量装置测量噪声电平，所述噪声电平是在所述业务信道上从所述选中的基站接收不到信号时的接收信号电平，wherein said measuring means measures a noise level, said noise level being the received signal level when no signal is received from said selected base station on said traffic channel, 所述判断装置判断所述测量到的所述链路建立信号的电场强度和所述噪声电平之间的差值是否小于第二阈值；以及The judging means judges whether the difference between the measured electric field strength of the link establishment signal and the noise level is smaller than a second threshold; and 若所述差值小于所述第二阈值，则所述控制装置让所述请求装置重新发出所述业务信道分配请求。If the difference is smaller than the second threshold, the control means allows the request means to resend the traffic channel allocation request. 4.一种基站，它把业务信道分配给移动台，并通过所述业务信道首先与所述移动台建立链路，然后建立与所述移动台的呼叫连接，4. A base station, which distributes a traffic channel to a mobile station, and first establishes a link with the mobile station through the traffic channel, and then establishes a call connection with the mobile station, 所述基站包括：The base station includes: 测量装置，用来测量当执行链路操作以便建立用于所述业务信道的链路时所述业务信道上信号的电场强度，其中所述测量装置通过计算在多个时隙中测量的电场强度的平均值来测量电场强度；和measuring means for measuring an electric field strength of a signal on said traffic channel when a link operation is performed so as to establish a link for said traffic channel, wherein said measuring means calculates the electric field strength measured in a plurality of time slots The average value of to measure the electric field strength; and 判断装置，用来根据所述测得的电场强度判断所述链路操作是否应该继续，judging means for judging whether the link operation should continue according to the measured electric field strength, 其中所述测得的电场强度包括信号电平和噪声电平，所述信号电平是在通过所述业务信道从所述移动台接收到信号时的接收信号电平，而所述噪声电平是在通过所述业务信道从所述移动台接收不到信号时的接收信号电平，wherein said measured electric field strength comprises a signal level and a noise level, said signal level being the received signal level when a signal is received from said mobile station over said traffic channel, and said noise level being the received signal level at which no signal is received from said mobile station over said traffic channel, 若所述信号电平小于第一阈值，或所述信号电平和所述噪声电平之间的差值小于第二阈值，则所述判断装置判定所述链路操作应该结束。If the signal level is smaller than a first threshold, or the difference between the signal level and the noise level is smaller than a second threshold, the judging means judges that the link operation should end. 5.一种基站，它响应一个移动台通过控制信道发送的业务信道分配请求而把业务信道分配给所述移动台，并通过所述业务信道与所述移动台建立链路，5. A base station which assigns a traffic channel to said mobile station in response to a traffic channel assignment request sent by a mobile station via a control channel, and establishes a link with said mobile station via said traffic channel, 所述基站包括：The base station includes: 测量装置，用来测量所述移动台通过所述业务信道发送的链路建立信号的电场强度，其中所述测量装置通过计算在多个时隙中测量的电场强度的平均值来测量电场强度；measuring means for measuring an electric field strength of a link setup signal transmitted by said mobile station through said traffic channel, wherein said measuring means measures the electric field strength by calculating an average value of electric field strengths measured in a plurality of time slots; 判断装置，用来根据所述测得的链路建立信号的电场强度判断为所述业务信道建立链路的链路操作是否应该继续；和Judging means, used to judge whether the link operation for establishing a link for the traffic channel should continue according to the measured electric field strength of the link establishment signal; and 控制装置，若所述判断装置的判断结果是否定的，则用来结束所述链路操作，The control means is used to end the link operation if the judgment result of the judging means is negative, 其中所述测得的电场强度包括信号电平和噪声电平，所述信号电平是在通过所述业务信道从所述移动台接收到信号时的接收信号电平，而所述噪声电平是在通过所述业务信道从所述移动台接收不到信号时的接收信号电平，以及wherein said measured electric field strength comprises a signal level and a noise level, said signal level being the received signal level when a signal is received from said mobile station over said traffic channel, and said noise level being the received signal level when no signal is received from said mobile station over said traffic channel, and 若所述信号电平小于第一阈值，或所述信号电平和所述噪声电平之间的差值小于第二阈值，则所述判断装置判定所述链路操作应该结束。If the signal level is smaller than a first threshold, or the difference between the signal level and the noise level is smaller than a second threshold, the judging means judges that the link operation should end. 6.一种移动台，它(1)根据与多个基站对应的控制信道上发射的信号的电场强度从所述多个基站中选择第一基站，并进入备用状态，以及(2)响应于经对应于第一基站的控制信道发送的业务信道分配请求，首先通过经由第一基站分配的业务信道向第一基站发送用于建立同步的突发信号和/或从第一基站接收该突发信号来建立一个链路，然后进入业务信道上的会话状态，6. A mobile station that (1) selects a first base station from among the plurality of base stations based on the electric field strength of signals transmitted on control channels corresponding to the plurality of base stations, and enters a standby state, and (2) responds to A traffic channel allocation request sent via a control channel corresponding to the first base station, firstly transmits a burst signal for establishing synchronization to the first base station and/or receives the burst signal from the first base station through the traffic channel allocated via the first base station signal to establish a link, and then enter the session state on the traffic channel, 所述移动台包括：The mobile station includes: 电场强度测量装置，用来以将控制信道切换到业务信道的链路信道建立顺序，测量(i)从第一基站经业务信道发送的突发信号的电场强度，以及(ii)业务信道的干扰波的电场强度；An electric field intensity measuring device for measuring (i) the electric field intensity of a burst signal transmitted from the first base station via the traffic channel, and (ii) the interference of the traffic channel in a link channel establishment sequence in which the control channel is switched to the traffic channel The electric field strength of the wave; 判断装置，用来判断电场强度测量装置所测量的突发信号的电场强度和干扰波的电场强度之间的差是否小于一个预定阈值；以及Judging means for judging whether the difference between the electric field strength of the burst signal measured by the electric field strength measuring device and the electric field strength of the interference wave is smaller than a predetermined threshold; and 控制装置，用来根据所述电场强度测量装置获得的测量结果，控制建立用于业务信道的链路的操作，其中control means for controlling the operation of establishing a link for a traffic channel based on the measurement result obtained by said electric field strength measuring means, wherein 当判断装置判断电场强度测量装置所测量的突发信号的电场强度与业务信道的干扰波的电场强度之间的差小于所述预定阈值时，移动台再次经控制信道向第一基站发出业务信道分配请求。When the judging device judges that the difference between the electric field strength of the burst signal measured by the electric field strength measuring device and the electric field strength of the interference wave of the traffic channel is less than the predetermined threshold, the mobile station sends the traffic channel to the first base station again via the control channel Assignment request. 7.权利要求6的移动台，其特征在于：7. The mobile station of claim 6, characterized in that: 当没有从第一基站从业务信道接收到任何信号时，干扰波的电场强度是接收信号电场强度。When no signal is received from the traffic channel from the first base station, the electric field strength of the interference wave is the received signal electric field strength. 8.权利要求6的移动台，其特征在于：8. The mobile station of claim 6, characterized in that: 通过计算在多个时隙中测量的电场强度的平均值来分别测量突发信号的电场强度和干扰波的电场强度。The electric field strength of the burst signal and the electric field strength of the disturbance wave are respectively measured by calculating the average value of the electric field strength measured in a plurality of time slots. 9.权利要求7的移动台，其特征在于：9. The mobile station of claim 7, characterized in that: 通过计算在多个时隙中测量的电场强度的平均值来测量接收信号电场强度。The received signal electric field strength is measured by calculating the average value of electric field strengths measured in a plurality of time slots. 10.权利要求6的移动台，其特征在于：10. The mobile station of claim 6, characterized in that: 从第一基站发出的用于建立同步的突发信号包括(1)首先发送的同步突发信号，以及(2)在同步突发信号之后发送的空闲突发信号。The burst signals sent from the first base station for establishing synchronization include (1) a synchronization burst signal sent first, and (2) an idle burst signal sent after the synchronization burst signal. 11.一种基站，它(1)响应于从移动台经与所述移动台对应的控制信道发送的业务信道分配请求，将业务信道分配给所述移动台，以及(2)通过在所分配的业务信道上向所述移动台发送用于建立同步的突发信号和/或从所述移动台接收该突发信号，首先建立一个链路，然后建立与移动台的呼叫连接，11. A base station that (1) allocates a traffic channel to the mobile station in response to a traffic channel allocation request transmitted from the mobile station via a control channel corresponding to the mobile station, and (2) sending a burst signal for establishing synchronization to the mobile station on the traffic channel of the mobile station and/or receiving the burst signal from the mobile station, first establishing a link, and then establishing a call connection with the mobile station, 所述基站包括：The base station includes: 电场强度测量装置，用来以将控制信道切换到业务信道的链路信道建立顺序，测量(i)从移动台经业务信道发送的突发信号的电场强度，以及(ii)业务信道的干扰波的电场强度；An electric field strength measuring device for measuring (i) the electric field strength of a burst signal transmitted from a mobile station via a traffic channel, and (ii) an interference wave of a traffic channel in a link channel establishment sequence in which a control channel is switched to a traffic channel electric field strength; 判断装置，用来判断电场强度测量装置所测量的突发信号的电场强度和干扰波的电场强度之间的差是否小于一个预定阈值；以及Judging means for judging whether the difference between the electric field strength of the burst signal measured by the electric field strength measuring device and the electric field strength of the interference wave is smaller than a predetermined threshold; and 控制装置，用来根据所述电场强度测量装置获得的测量结果，控制建立用于业务信道的链路的操作，其中control means for controlling the operation of establishing a link for a traffic channel based on the measurement result obtained by said electric field strength measuring means, wherein 当判断装置判断电场强度测量装置所测量的突发信号的电场强度与业务信道的干扰波的电场强度之间的差小于所述预定阈值时，就结束建立用于业务信道的链路的操作。When the judging means judges that the difference between the electric field strength of the burst signal measured by the electric field strength measuring means and the electric field strength of the interference wave of the traffic channel is smaller than the predetermined threshold, the operation of establishing the link for the traffic channel is terminated. 12.权利要求11的基站，其特征在于：12. The base station of claim 11, characterized in that: 当移动台发出业务信道分配请求时，对移动台的多个载频中的每个载频的干扰波的电场强度进行测量，并且基站从多个空闲业务信道中选择一个干扰波具有最小电场强度的空闲业务信道，作为所分配的业务信道。When the mobile station sends a traffic channel allocation request, the electric field strength of the interference wave of each of the multiple carrier frequencies of the mobile station is measured, and the base station selects an interference wave with the minimum electric field strength from a plurality of idle traffic channels The idle traffic channel of , as the assigned traffic channel. 13.权利要求11的基站，其特征在于：13. The base station of claim 11, characterized in that: 通过计算在多个时隙中测量的电场强度的平均值来分别测量突发信号的电场强度和干扰波的电场强度。The electric field strength of the burst signal and the electric field strength of the disturbance wave are respectively measured by calculating the average value of the electric field strength measured in a plurality of time slots.
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